Callie solved this one-variable equation. When she was done, she tried to verify her answer, but found that it was wrong. Can you find her mistake?
1/2 (4k+8) = 10
1. 2k+16=10
2. 2k=-6
3. k=3
What was Callie's mistake?
A:Callie should have added 10 to both sides in step 2.
B:In step 1, when Callie distributed the 1/2 to the 8, she multiplied incorrectly.
C:Callie divided by 2 instead of multiplying by 2 in step 3.
D:Callie should have added 16 to both sides in step 2.
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